Control device of home energy management system

ABSTRACT

Provided is a control device of a home energy management system (HEMS). The control device includes a communication unit configured to connect to a HEMS gateway, a storage unit configured to store power usage information for a predetermined period in a home in which the HEMS gateway is installed, and a control unit configured to predict power consumption amount on the basis of the power usage information for the predetermined period, predict a power generation amount of a photovoltaic (PV) module connected to the HEMS gateway, calculate a PV power amount to be sold on the basis of the predicted power generation amount and power consumption amount, set sales price with respect to the calculated power amount on the basis of purchase information of purchasers, and control the HEMS so that sale power corresponding to the calculated power amount is provided on the basis of the set sales price.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of priority in Korean Patent Application Nos. 10-2016-0099831, 10-2016-0099832, and 10-2016-0099833, filed on Aug. 5, 2016, which are hereby incorporated by reference in their entireties under 35 U.S.C. § 119.

BACKGROUND

The present disclosure relates to a control device of a home energy management system.

Home energy management systems represent systems for efficiently managing the use of electric power in household appliances. Such a home energy management system may be connected to various power supply devices or power consumption devices in the home to monitor the power supply status and power consumption status and thereby to control an operation of each of the devices according to the monitored results.

In recent years, the spread of a photovoltaic (PV) module has been expanding. Since power supplied from the PV module is effective in terms of reduction of the electric bill because no separate electric charge is generated. In addition, revenue may be generated by selling at least a portion of the power supplied from the PV module to another person or the power facility.

However, in case of the current home energy management system, usage information of the power supplied from the PV module is not intuitively provided to the user. Thus, the user may not clearly appreciate the benefit of using the power generated from the PV module and may not be provided the maximum benefit according to the sensation result.

Also, in case of the home energy management system, a storage device for surplus power of the power supplied from the PV module is not provided, or battery capacity of the storage device is not sufficient even though the storage device is provided. Thus, the surplus power may be directly emitted to the system or resold at a low price. As a result, it is necessary to efficiently utilize the power supplied from the PV module by minimizing the generation of the surplus power.

In addition, since the spread of the PV module is expanding, the trading of the PV power may also become more active in the future. Accordingly, there is a need for a scheme that is capable of facilitating the user's convenience by more conveniently trading the PV power or by automatically trading the PV power.

SUMMARY

Embodiments provide a control device of a home energy management system, which is capable of automatically calculating an amount of PV power to be sold by a user to improve user's convenience during PV power transactions.

Embodiments also provide a control device of a home energy management system, which is capable of actively solving limitations that occur when an actual power generation amount of a PV module is less than a predicted power generation amount.

Embodiments also provide a control device of a home energy management system, which is capable of intuitively providing a profit of using and transacting power generated from a PV module to a user.

In one embodiment, a control device of a home energy management system predicts a power generation amount of a PV module and calculates the PV generation power to be sold on the basis of the predicted power generation amount.

The control device may automatically calculate the amount of PV power to be sold on the basis of the predicted power consumption amount and the predicted power generation amount according to the power usage information for a predetermined period.

The control device may predict the time-based power generation amount of the PV module and calculate the PV power amount to be sold for each time on the basis of the estimated time-based power generation amount and power consumption amount.

In another embodiment, a controller of a home energy management system determines that a power amount to be sold is insufficient when an actual power generation amount of a PV module is less than a predicted power generation amount and supplements deficiency of power by using power stored in the energy storage device or by purchasing power from another user or power facility.

In yet another embodiment, a control device of a home energy management system transmits information with respect to a power generation amount of a PV module, an amount of power consumed at a home, an amount of sold power, and a benefit of using the power generation amount to a terminal of a user.

The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram of a home energy management system according to an embodiment.

FIG. 2 is a view illustrating a power flow of the home energy management system of FIG. 1.

FIG. 3 is a schematic block diagram of a control device for controlling the home energy management system according to an embodiment.

FIG. 4 is a ladder diagram for explaining an operation method of an HEMS according to further another embodiment.

FIG. 5 is a view for explaining a power mode control screen for controlling the power mode of the EV according to an embodiment.

FIG. 6 is a view for explaining an example in which a power mode of the EV is set through a switch button according to an embodiment.

FIG. 7 is a view for exampling a charging mode screen provided through the terminal when the EV operates in a charging mode according to an embodiment.

FIG. 8 is a view for exampling a discharging mode screen provided through the terminal when the EV operates in a discharging mode according to an embodiment.

FIG. 9 is a view for explaining a screen on which information on acquired profits is displayed based on the power mode of the EV according to an embodiment.

FIG. 10 is a flowchart illustrating an operation method of the control device according to an embodiment.

FIG. 11 is a table showing predicted results of the time-based power generation amount when the control device predicts the time-based power generation amount of the PV module according to an embodiment.

FIG. 12 is a table showing information on a usable time of each of the home appliances, which is generated by the control device on the basis of the predicted results of the time-based power generation amount of FIG. 11.

FIG. 13 is a flowchart for illustrating a method for controlling operations of the home appliances through the control device on the basis of the predicted results of the time-based power generation amount of the PV module according to an embodiment.

FIG. 14 is a view illustrating an example of priority order information set with respect to each of the home appliances.

FIG. 15 is a view illustrating an example of an operation schedule of each of the home appliances, which is generated by the control device on the basis of the embodiments of FIGS. 11 and 14, according to an embodiment.

FIG. 16 is a view illustrating an example of an operation schedule that is changed by the control device when the power generation amount of the PV module and the predicted power generation amount are different from each other.

FIGS. 17A and 17B are views illustrating examples of power usage information for each various home appliances, each of which is provided to a terminal by the control device, respectively.

FIG. 18 is a flowchart illustrating an operation method of the control device according to an embodiment.

FIG. 19 is a table showing predicted results of a time-based power generation amount when the control device predicts the time-based power generation amount of the PV module according to an embodiment.

FIG. 20 is a table showing an example of a PV power amount to be sold, which is calculated based on the predicted results of the time-based power generation amount of FIG. 19 and a time-based power consumption amount.

FIGS. 21A and 21B are views illustrating an example of an operation in which sale power is supplied from a seller to a purchaser on the basis of the PV power generation amount to be sold, respectively.

FIG. 22 is a flowchart illustrating an operation of the control device when an actual power generation amount of the PV module is less than the predicted power generation amount according to an embodiment.

FIGS. 23 and 24 are views illustrating an operation in which the sale power is supplied to the purchaser according to an embodiment of FIG. 22, respectively.

FIG. 25A is a view illustrating an example of the PV power usage information provided to the terminal by the control device for a user, and FIG. 25B is a view illustrating an example of power usage information provided to the terminal by the control device for a different user.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. In the following description, used terms, such as a “module” and a “unit”, are used for convenience of description, and they do not have different meanings or functions in and of themselves.

FIG. 1 is a schematic block diagram of a home energy management system according to an embodiment.

Referring to FIG. 1, a home energy management system (HEMS) 10 may be mainly implemented in the home and manage energy (power) supply, consumption, storage, and the like in the home. The HEMS 10 may include an HEMS gateway 100, a sensor control device 200, and a control device 300.

The HEMS gateway 100 may receive sensing information acquired from the sensor control device 200. The HEMS gateway 100 may transmit the received sensing information to the control device 300. The HEMS gateway 100 may exchange information with the sensor control device 200 through a short-range wireless communication module. The short-range wireless communication module may be one of BLUETOOTH®, Wi-Fi, and ZigBee®, but these are merely examples of short-range wireless communication modules useable with the HEMS gateway 100 and are not intended to be exhaustive of all short-range wireless communication modules.

The HEMS gateway 100 may receive information on power from power management-related devices that are installed in the home. The HEMS gateway 100 may transmit information on the received power to the control device 300. The HEMS gateway 100 and the control device 300 may be connected to the each other through the internet, but this is merely an example.

The HEMS gateway 100 may be connected to devices associated with power supply, power consumption, and power storage, which are installed or provided in the home to control operations of the connected devices. As illustrated in FIG. 1, the HEMS gateway 100 may be connected to at least one of a photovoltaic (PV) inverter 110, meter (or a smart meter) 120, an energy storage device (or an energy storage system (ESS)) 130, an electric vehicle (EV) charger 140, and a smart plug 150. However, the kinds of devices connected to the HEMS gateway 100 may be variously changed according to an embodiment.

The PV inverter 110 may convert DC power supplied from the PV module 111 into AC power. Particularly, the PV module 111 may generate power by using a photoelectric effect and supply the generated power to the home. Although the power generated by the PV module 111 is DC power, various power consumption devices provided in the home may operate by using AC power. Thus, the PV inverter 110 may convert the DC power into the AC power to supply the converted AC power to the home. Although the HEMS 10 includes the PV inverter 110 and the PV module 111 in this disclosure, the HEMS 10 may be provided with other various types of environmentally friendly power generation modules and inverters corresponding thereto. Examples of the power generation modules and the inverters may include a wind power generation module and an inverter corresponding to the wind power generation module.

The meter 120 may measure a usage amount of power supplied from a power system 121 to the home and consumed in the home. Particularly, the meter 120 according to an embodiment may be implemented as a smart meter. The smart meter may include a communication module for transmitting information on the power usage amount to the HEMS gateway 100.

The ESS 130 may store power supplied from the PV module 111, the power system 121, and/or a battery of an EV 141 or residual power remaining after the consumption of the supplied power. A structure and operation of the ESS 130 will be described below in more detail with reference to FIG. 2.

The EV charger 140 may be connected to the EV 141 to control charging and discharging with respect to the battery provided in the EV 141.

The smart plug 150 may include a power usage amount measurement module measuring a power usage amount of the connected home appliance and a communication module for transmitting the measured power usage amount to the HEMS gateway 100. Also, the power may be supplied or blocked to the connected home appliance according to a control signal received from the HEMS gateway 100.

According to an embodiment, when a separate communication module is provided in the home appliance 151, the HEMS gateway 100 may be connected to the home appliance 151 to control an operation of the home appliance 151.

According to an embodiment, when a separate sensor (for example, a smartThinQ® sensor and the like) for detecting an operation of the home appliance 151 is attached to the home appliance 151, the HEMS gateway 100 may be connected to the corresponding sensor to confirm whether the home appliance 151 is operating.

Although one smart plug 150 and one home appliance 151 connected to the one smart plug 150 are illustrated in FIG. 1, each of the smart plug 150 and the home appliance 151 may be provided in plurality according to an embodiment. In this case, the home appliances may be connected to the different smart plugs from each other.

The sensor control device 200 may be connected to at least one of a camera 210, a motion detection sensor 220, a lighting device 230, and a door/window sensor 240 to receive various information from the connected components. The sensor control device 200 may transmit the various received information to the HEMS gateway 100 or the control device 300. Also, the sensor control device 200 may control an operation of the connected sensor. The type of the sensor connected to the sensor control device 200 is not limited to the types shown, and other various sensors may be connected to the sensor control device 200.

The camera 210 may transmit an image frame such as a still image or a moving image acquired by using an image sensor to the sensor control device 200. The sensor control device 200 may transmit the received image frame to the control device 300. The control device 300 may analyze the received image frame to detect various situations such as a user's presence/absence in the room, an invasion by an outsider, or a fire occurrence on the basis of the analyzed result. The received image frame may be directly analyzed to detect the above-described various situations according to an embodiment.

The motion detection sensor 220 may be mainly implemented as an infrared sensor. The motion detection sensor 220 may detect a change in an infrared ray to transmit a signal corresponding to the detected change to the sensor control device 200. The sensor control device 200 may transmit the received signal to the control device 300, and the control device 300 may detect the user's presence/absence in the room on the basis of the received signal.

The lighting device 230 may be installed in various positions inside and outside the home (e.g., a front door, a kitchen, a living room, a toilet, etc.) to emit light. The sensor control device 200 may control ON/OFF of the lighting device 230, brightness, a color, a flicker of light, or the like.

The door/window sensor 240 may detect an open/close state of a door or a window to determine whether the user is present/absent or may be used to determine whether the outsider has invaded the house.

The control device 300 may be connected to each of the HEMS gateway 100 and the sensor control device 200, for example, through the Internet. The control device 300 may be provided in the home according to an embodiment. In this case, the control device 300 may be connected to each of the HEMS gateway 100 and the sensor control device 200 by using a LAN cable or the like in a wired manner. Alternatively, the control device 300 may be connected through Wi-Fi in a wireless manner.

The control device 300 may receive various information associated with the devices 110, 120, 130, 140, 141, 150, and 151 from the HEMS gateway 100. Also, the control device 300 may receive various information generated by the sensors 210, 220, 230 and 240 from the sensor control device 200.

The control device 300 may perform overall power management in the home by using the various information received. The control device 300 may determine a power state in the home, the user's presence/absence in the room, and the like by using the various information received from the HEMS gateway 100 or the sensor control device 200. The control device 300 may generate control signals for controlling operations of various devices 110, 120, 130, 140, and 150 connected to the HEMS gateway 100 and the various sensors 210, 220, 230, and 240 connected to the sensor control device 200 to transmit the generated control signals to the HEMS gateway 100 or the sensor control device 200 on the basis of the confirmed results.

That is, a main component for controlling the overall operation of the HEMS 10 according to an embodiment may correspond to the control device 300. The control device 300 may be implemented in the form of a server.

However, according to an embodiment, the HEMS gateway 100 and the sensor control device 200 may be directly connected to each other to exchange various information and the control signals therebetween. In this case, the HEMS gateway 100 may perform all of the function of the HEMS gateway 100 and the function of the control device 300. Thus, the operations of the control device 300, which will be described with reference to the drawings, may be understood as operations performed by the HEMS gateway 100.

Also, the control device 300 may transmit to a terminal 400 the information received from the HEMS gateway 100 or the sensor control device 200 or the information on the power state, the user's presence/absence in the room, and the like, which are confirmed by using the received information.

The terminal 400 may be implemented as a PC, a notebook, a smart phone, a tablet PC, or the like. According to an embodiment, the terminal 400 may be installed in and executed by an application terminal connected to the control device 300 to receive the above-described various information or for controlling the operations of the sensors 210, 220, 230, and 240.

FIG. 2 is a view illustrating a power flow of the HEMS of FIG. 1.

Before describing a power flow of the HEMS 10, the components of the ESS 130 and an operation of each of the components of the ESS 130 will be described.

The ESS 130 may include an energy management module 131, a power conversion unit 132, and a battery 133.

The energy management module 131 may operate under the control of the HEMS gateway 100 or the control device 300 connected to the HEMS gateway 100. The energy management module 131 may control an overall operation of the ESS 130.

The power conversion unit 132 may include a plurality of inverters and converters. For example, the power conversion unit 132 may convert the power stored in the battery 133 from DC power into AC power to supply the converted AC power to the outside. The power conversion unit 132 may convert the remaining AC power into the DC power. The power conversion unit 132 may include a DC/AC inverter for storing the converted DC power into the battery 133.

Although not shown, the HEMS 10 according to an embodiment may be configured in the form in which the PV module 111 is connected to the power conversion unit 132. Here, the power supplied from the PV module 111 may be converted by the power conversion unit 132, and the converted power may be stored in the battery 133 or supplied to the EV 141 or the home appliance 151. In this case, the power conversion unit 132 may include a DC/DC converter for converting the power supplied from the PV module 111 so that the converted power is stored in the battery 133.

The power conversion operation of the above-described power conversion unit 132 may be controlled by the energy management module 131.

Although not shown, the ESS 130 may include a power management module and a battery management module. The power management module may manage power of the ESS 130 such as the power conversion unit 132 and the battery management module. The battery management module may measure a temperature, current, a voltage, a charged amount, and the like of the battery 133 and monitor states of the battery 133. Also, the battery management module may control the battery 133 so that an operation environment of the battery 133 is optimized based on the monitored states of the battery 133. The energy management module 131 may control operations of the power management module and the battery management module.

Hereinafter, the power flow of the HEMS 10 according to an embodiment will be described.

Referring to FIG. 2, the PV inverter 110 may convert the DC power supplied from the PV module 111 into the AC power. The converted power may be supplied to the EV 141 connected to the EV charger 140 or the home appliance 151 connected to the smart plug 150 and then consumed. According to an embodiment, when remaining power is generated after the consumption, the generated remaining power may be discharged to the power system 121 or sold again or be stored in the battery 133 of the ESS 130.

The meter 120 may measure a power usage amount on the basis of the power supplied from the power system 121. The power supplied from the power system 121 may be consumed by the EV 141 or the home appliance 151 or converted into the form of the DC power by the power conversion unit 132 and then stored in the battery 133.

The EV charger 140 may charge the battery of the EV 141 by using the power generated by the PV module 111, the power supplied from the power system 121, or the power stored in the ESS 130. To charge the battery of the EV 141, the EV charger 140 may convert the AC power into the DC power.

Also, the EV charger 140 may discharge the power charged in the battery of the EV 141. In this case, the EV charger 140 may convert the DC power charged in the battery of the EV 141 into the AC power. The converted power may be supplied to the home appliance 151, stored in the ESS 130, discharged to the power system 121, or sold again.

The smart plug 150 may supply the power generated by the PV module 111, the power supplied from the power system 121, or the power stored in the ESS 130 to the home appliance 151.

As described with reference to FIGS. 1 and 2, since the HEMS gateway 100 is connected to various components 110, 120, 130, 140, and 150 that are provided for each power path within the home, the HEMS gateway 100 may acquire a power flow for each power path or various information associated with the power state. The control device 300 connected to the HEMS gateway 100 may control supply, consumption, and storage operations of power in the home on the basis of the acquired information.

Hereinafter, components of the control device for controlling the overall operation of the HEMS 10 according to an embodiment will be described with reference to FIG. 3.

FIG. 3 is a schematic block diagram of a control device for controlling an operation of the HEMS 10 according to an embodiment.

Referring to FIG. 3, the control device 300 may include a communication unit 310, a storage unit 320, and a control unit 330. Since the components provided in the control device 300 are not limited thereto, the control device 300 according to an embodiment may include more components. Also, as discussed above, when the HEMS gateway 100 includes the control device 300, the HEMS gateway 100 may include a communication unit, a storage unit, and a control unit, like the control device 300.

The communication unit 310 may include one or more modules for enabling wired communication or wireless communication between the control device 300 and the HEMS gateway 100, between the control device 300 and the sensor control device 200, and between the control device 300 and the terminal 400.

The control device 300 may receive various information or data associated with the operations between the HEMS gateway 100, the sensor control device 200, and/or terminal 400 and the HEMS 10 to transmit a control signal or command for controlling the HEMS 10.

The storage unit 320 may store the various information or data received through the communication unit 310. Also, the storage unit 320 may store various algorithms, application programs, or other applications for generating control signals or commands that control the operation of the HEMS 10 by using the received information or data.

The control unit 330 may control operations of the various components provided in the control device 300. Also, the control unit 330 may execute the various algorithms, application programs, or other applications stored in the storage unit 320 and process the received information or data to generate a control signal or command for controlling the operation of the HEMS 10.

FIG. 4 is a ladder diagram for explaining an operation method of an HEMS according to further another embodiment.

In the following drawing, it is assumed that a power mode of an EV 141 is in a charging mode. That is, it is assumed that the EV 141 is receiving power through an EV charger 140.

An HEMS gateway 100 acquires user absence information and user presence information (S901).

In an embodiment, the user absence information may include information of a time for which the user is absent in the home. Particularly, the absence information may include a difference between the current time and the last time at which the presence of the user in the home is detected.

In an embodiment, the user presence information may include information of a time for which the user is present in the home. Particularly, the presence information may include a difference between the current time and the last time at which the presence of the user in the home is detected and a difference between the last time at which the presence of the user in the home is detected and an initial time at which the presence of the user in the home is detected.

In an embodiment, the user absence information and presence information may be acquired through at least one of a camera 210, a motion detection sensor 220, and a door/window sensor 240, which are provided in the home.

The camera 210 provided in the home may photograph the inside of the home in real-time to transmit the photographed image to the HEMS gateway 100. The HEMS gateway 100 may transmit the photographed image to a control device 300. The control device 300 may determine whether the user is absent or present in the home through the photographed image.

The motion detection sensor 220 provided in the home may detect a motion of the user that is present in the home. The motion detection sensor 220 may transmit information on the detected motion of the user to the HEMS gateway 100. The HEMS gateway 100 may transmit the information on the detected motion of the user to the control device 300. The control device 300 may determine whether the user is absent or present in the home by using the information on the detected motion of the user.

The door/window sensor 240 provided in the home may detect opening and closing states of a door or a window in the home to transmit the detected information to the HEMS gateway 100. The HEMS gateway 100 may transmit the information on the detected opening and closing states of the door or window to the control device 300. The control device 300 may determine whether the user is absent or present in the home by using the information on the detected opening and closing states of the door or window.

The HEMS gateway 100 may include a wired communication interface or a wireless communication interface to receive the absence information and the presence information from a sensor control device 200.

The HEMS gateway 100 may transmit one of the acquired absence information and the acquired presence information to a communication unit 310 of the control device 300 (S903).

The HEMS gateway 100 may transmit the acquired absence information and presence information to the control device 300 through the Internet. The communication unit 310 of the control device 300 may receive the absence information and presence information from the wireless communication interface (not shown) provided in the HEMS gateway 100 through the Internet standard.

The HEMS gateway 100 may periodically transmit the acquired absence information and presence information to the control device 300. For example, the HEMS gateway 100 may transmit the acquired absence information and presence information to the control device 300 every hour.

The control device 300 may determine the power mode of the EV on the basis of the absence information and presence information received from the gateway 100. The power mode of the EV may include a charging mode and a discharging mode.

The charging mode may be a mode for charging the EV 141 by using at least one of power generated from the PV module 111 and power supplied from the power system 121. The charging mode according to this embodiment may be called a PV charging mode.

The discharging mode may be a mode for discharging and supplying the power stored in the battery of the EV 141 to the home appliance. The discharging mode of the EV according to this embodiment may be called a vehicle to home (V2H) mode.

The control device 300 determines whether the user is absent or present for a long time on the basis of one of the absence information and the presence information received from the gateway 100 (S905).

When the user is absent or present for a long time, the control unit 330 of the control device 300 determines the power mode of the EV 141 as the discharging mode (S907).

In an embodiment, when a difference between the current time and the last time at which the presence of the user in the home is detected is greater than a first reference time, the control unit 330 may determine that the user is absent for a long time. For example, the first reference time may be one hour, but is only an example.

In an embodiment, when the difference between the current time and the last time at which the presence of the user in the home is detected is less than a second reference time, or a difference between an initial time at which the presence of the user in the home is detected and the last time at which the presence of the user in the home is detected is greater than a third reference time, it may be determined that the user is present in the home for a long time. Here, the second reference time may be about 30 minutes, and the third reference time may be about 45 minutes, but this is only an example.

The first reference time, the second reference time, and the third reference time may be the same, but need not be limited thereto. For example, the first reference time, the second reference time, and the third reference time may be different from each other.

In another embodiment, when the difference between the current time and the last time at which the presence of the user in the home is detected is less than a second reference time, and a difference between an initial time at which the presence of the user in the home is detected and the last time at which the presence of the user in the home is detected is greater than a third reference time, it may be determined that the user is present in the home for a long time.

In an embodiment, when the user is absent or present in the home for a long time, the control unit 330 of the control device 300 may determine the power mode of the EV 141 as the discharging mode.

The control unit 330 may control the HEMS gateway 100 or the EV 141 so that the power mode of the EV 141 becomes the discharging mode.

The control unit 330 of the control device 300 transmits a discharging mode recommendation message to the HEMS gateway 100 as the power mode of the EV 141 is determined as the discharging mode (S909).

In an embodiment, the discharging mode recommendation message may be a message for setting the power mode of the EV 141 to the discharging mode.

The control device 300 may transmit the discharging mode recommendation message to the HEMS gateway 100 through the communication unit 310.

According to another embodiment, when the power mode of the EV 141 is determined as the discharging mode, the control unit 330 may directly transmit the discharging mode recommendation message to the terminal 400.

The HEMS gateway 100 transmits the discharging mode recommendation message received from the control device 300 to the terminal 400 (S911). The HEMS gateway 100 may transmit the discharging mode recommendation message to the terminal 400 through the short-range wireless communication.

According to another embodiment, the HEMS gateway 100 may transmit the charging control message to the EV charger 140. The EV charger 140 may charge the EV 141 on the basis of the received charging control message.

The terminal 400 displays the discharging mode recommendation message received from the HEMS gateway 100 (S913).

The terminal 400 may transmit a discharging control request signal to the EV 141 on the basis of the power mode control screen including the discharging mode recommendation message, and the EV 141 may operate in the discharging mode according to the discharging control request signal.

The operations S913 to S917 will be described with reference to the following drawings.

FIG. 5 is a view for explaining a power mode control screen for controlling the power mode of the EV according to an embodiment.

FIG. 5 illustrates a power mode control screen 1000 including the discharging mode recommendation message received from the control device 300. The power mode control screen 1000 may be displayed through the terminal 400.

The power mode control screen 1000 may be a screen generated based on the information transmitted through the control device 300.

The power mode control screen 1000 may be a screen displayed according to the execution of the power management application installed in the terminal 400.

When the terminal 400 receives the discharging mode recommendation message through the control device 300, the power management application may be automatically executed to display the power mode control screen 1000.

The power mode control screen 1000 may include a discharging mode recommendation message 1010, a discharging mode setting item 1030, a minimum charging amount setting item 1050, and a power saving cost item 1070.

The discharging mode recommendation message 1010 may include a text that informs the long-term absence situation or the long-term presence situation of the user and recommends the power mode of the EV 141 so that the power mode is switched into the discharging mode. That is, when the user does not use the EV 141 for a long time, the discharging mode recommendation message 1010 may include a text that recommends the power mode so that the EV 141 is used as one energy storage system.

The discharging mode setting item 1030 may be an item for setting the power mode of the EV 141 to the discharging mode (V2H mode). The user may activate or inactivate the discharging mode of the EV 141 through the discharging mode setting item 1030. When the discharging mode is inactivated, it is seen that the EV 141 basically operates in the charging mode. When the discharging mode is activated, the power mode of the EV 141 may be switched from the charging mode to the discharging mode.

The minimum charging amount setting item 1050 may be an item for setting a power amount that has to be minimally stored in the battery of the EV 141. In FIG. 5, the minimum charging amount setting item 1050 may be realized in a method for setting a minimum travelable distance of the EV 141, but is not limited thereto. For example, the minimum charging amount setting item 1050 may be realized in a method for setting a ratio of the minimum charging amount.

The power saving cost item 1070 may include a saving cost per unit power, which is capable of being reduced as the power mode of the EV 141 is switched into the discharging mode. For example, in FIG. 5, when the power mode of the EV 141 is switched into the discharging mode, the power saving cost item 1070 may indicate that a power cost of about 3.3 Euro per about 1 kWh is saved.

Information set through the power mode control screen 1000 displayed by the terminal 400 may be transmitted to the HEMS gateway 100 or the control device 300. The terminal 400 may transmit the set information to the HEMS gateway 100 through the short-range wireless communication and transmit the set information to the control device 300 through the Internet communication.

According to an embodiment, the power mode of the EV 141 may be set through a switching button. This will be described with reference to FIG. 6.

FIG. 6 is a view for explaining an example in which a power mode of the EV is set through a switch button according to an embodiment.

Referring to FIG. 6, a charging mode button 591 for setting the power mode of the EV 141 to a solar charging mode (the charging mode) is illustrated. The charging mode button 591 may be provided in the home. When the charging mode button 591 is selected, a sensor control device 200 may transmit a message for informing that the charging mode button 591 is selected to the HEMS gateway 100. The HEMS gateway 100 may transmit the message received from the sensor control device 200 to the EV 141. Thus, the power mode of the EV 141 may be switched into the charging mode.

Referring to FIG. 6, a discharging mode button 593 for setting the power mode to the V2H mode (the discharge mode) is illustrated. The discharging mode button 593 may be provided in the house. When the discharging mode button 593 is selected, the sensor control device 200 may transmit a message for informing that the discharging mode button 593 is selected to the HEMS gateway 100. The HEMS gateway 100 may transmit the message received from the sensor control device 200 to the EV 141. Thus, the power mode of the EV 141 may be switched into the discharging mode.

When the EV 141 operates in the charging mode, the HEMS gateway 100 or the control device 300 may transmit information, in which the EV 141 is operating in the charging mode, to the terminal 400. The terminal 400 may provide the charging mode screen on the basis of the information for informing that the EV 141 is operating in the charging mode. This is as described in FIG. 7.

When the EV 141 operates in the discharging mode, the HEMS gateway 100 or the control device 300 may transmit information for informing that the EV 141 is operating in the discharging mode to the terminal 400. The terminal 400 may provide the discharging mode screen on the basis of the information for informing that the EV 141 is operating in the discharging mode. This is as described in FIG. 8.

The description will be made again with reference to FIG. 4.

The control unit 330 of the control device 300 determines that the charging amount of the EV 141 is less than the minimum charging amount or is about 100% (S909).

The charging amount of the EV 141 may be a charging amount of a battery provided in the EV 141.

The control unit 330 may receive information on the charging amount of the battery of the EV 141 from the EV 141 or the EV charger 140.

When the charging amount of the EV 141 is less than the minimum charging amount or is about 100%, the control unit 330 transmits power cost information to the HEMS gateway 100 (S921).

In an embodiment, the power cost information may include profits earned based on the power provided from the PV module 111 under the charging mode of the EV 141 and a power cost saved under the discharging mode of the EV 141.

The HEMS gateway 100 transmits the power cost information received from the control device 300 to the terminal 400, and the terminal 400 displays the received power cost information (S925).

An example for providing the power cost information will be described with reference to FIG. 9.

FIG. 7 is a view for exampling a charging mode screen provided through the terminal when the EV operates in a charging mode according to an embodiment.

Referring to FIG. 7, the terminal 400 may display the charging mode screen 600 according to the execution of the power management application.

The charging mode screen 600 may include a PV module icon 610 representing the PV module 111, a battery icon 630 representing the battery of the EV 141, a power system icon 650 representing the power system 121, and a home icon 670 representing the home in which the home appliances are installed.

When the EV 141 operates in the charging mode, the terminal 400 may display a power supply line 611 for informing that the PV module 141 supplies the power to the battery of the EV 141. When the EV 141 operates in the charging mode, the terminal 400 may display power supply interruption lines 631 and 651 for informing that the battery of the EV 141 does not supply power to the home appliances, and also, power is not supplied to the battery of the EV by power system 121, respectively.

The user may easily confirm that the EV 141 electrically charges the PV module 111 through the charging mode screen 600.

FIG. 8 is a view for exampling a discharging mode screen provided through the terminal when the EV operates in a discharging mode according to an embodiment.

Referring to FIG. 8, the terminal 400 may display the discharging mode screen 700 according to the execution of the power management application.

The discharging mode screen 700 may include the PV module icon 610 representing the PV module 111, the battery icon 630 representing the battery of the EV 141, the power system icon 650 representing the power system 121, and the home icon 670 representing the home in which the home appliances are installed.

When the EV 141 operates in the discharging mode, the terminal 400 may display a power supply line 701 for informing that the power charged in the battery of the EV 141 is supplied to the home appliances in the home. When the EV 141 operates in the discharge mode, the terminal 400 may display a power supply interruption line 703 for informing that the battery of the EV 141 does not receive the power from the PV module 111 and a power supply interruption line 705 for informing that the EV 141 does not receive the power from the power system 121.

The user may easily confirm that the EV 141 electrically discharges the EV 141 through the discharging mode screen 700.

FIG. 9 is a view for explaining a screen on which information on acquired profits is displayed based on the power mode of the EV according to an embodiment.

FIG. 9 illustrates a power profit screen 1100 providing information on power profits occurring as the EV 141 operates in the charging mode or the discharging mode.

Particularly, FIG. 9 illustrates an example of a power profit screen 1100 displayed when the charging amount of the EV 141 is about 100%. That is, when the charging amount of the EV 141 is about 100%, the control device 300 may transmit information for providing the power profit screen 1100 to the terminal 400.

The HEMS gateway 100 or the control device 300 may provide information on a power amount charged under the charging mode of the EV 141 to the terminal 400 and transmit information on a power amount discharged under the discharging mode, and the terminal 400 may provide the power profit screen 1100 on the basis of the information.

The power profit screen 1100 may be a screen displayed by the terminal 400 according to the execution of the power management application.

The power profit screen 1100 may include information 1110 with respect to a cost corresponding to the power amount charged in the battery of the EV 141 through the PV module 111 in the charging mode (or the solar charging mode) of the EV 141 and information 1130 with respect to profits corresponding to the power amount supplied to the home in the discharging mode (or the V2H mode) and the power amount supplied to the home.

The user may easily confirm the profits obtained in the power mode of the EV 141 through the power profit screen 1100.

According to various embodiments, the user may utilize the EV 141 as one energy storage system to efficiently perform the power management without purchasing a separate energy storage system.

According to further another embodiment, when the long-term absence situation or the long-term presence situation is detected based on one of the absence information and the presence information, the control device 300 may control the power of the battery of the EV 141 so that the power mode of the EV 141 is switched into the discharging mode.

Particularly, the control device 300 may determine the power mode of the EV 141 as the discharging mode when the long-term absence situation or the long-term presence situation is detected. Thereafter, the control device 300 may transmit the discharging control request signal to the EV 141. Thus, the EV 141 may operate in the discharging mode.

According to further another embodiment, the HEMS gateway 100 may include all the components of the control device 300 of FIG. 3. The HEMS gateway 100 may perform a function of the control device 300.

Particularly, the communication unit of the HEMS gateway 100 may receive at least one of the absence information and the presence information of the user to transmit the received information to the control device 300. The communication unit of the HEMS gateway 100 may transmit the received information to the control device 300.

When the long-term absence situation or the long-term presence situation is detected based on one of the absence information and the presence information, the control device 300 may transmit a discharging mode recommendation message, which recommends the power mode so that the power mode of the EV 141 is switched into the discharging mode, to the terminal 400.

Hereinafter, an operation performed by the control device 300 according to the embodiment will be described based on the predicted power generation amount of the PV module 111 will be described according to an embodiment.

FIG. 10 is a flowchart illustrating an operation method of the control device according to an embodiment.

Referring to FIG. 10, the control device 300 may predict the time-based power generation amount of the PV module 111 (S1400).

For example, the control device 300 may predict the time-based power generation amount of the PV module 111 on the basis of the power generation performance of the PV module 111, the weather forecast, the past power generation amount information, the sunlight irradiation angle, and the like.

The power generation performance and the past power generation amount information may be previously stored in the storage unit 320. Also, in the case of the information related to the weather forecast or the sunlight irradiation angle, the control device 300 may receive the information from the meteorological service server connected through the network or may acquire related information through the Internet.

In this disclosure, the control device 300 may predict the power generation amount of the PV module 111 in each time zone. However, according to another embodiment, the control device 300 may add the daily power generation amount of the PV module 111 to predict the power generation amount.

The control device 300 may generate information on a usable time of the home appliances on the basis of the predicted result of the time-based power generation amount of the PV module 111 (S1410).

The control device 300 may generate information on a usable time of each of the home appliances connected to the HEMS gateway 100 on the basis of the time-based power generation amount of the PV module 111, which is predicted in the operation S1400. For this, the control device 300 may store information of the home appliances connected to the HEMS gateway 100 and information on an average power consumption of each of the home appliances in the storage unit 320.

According to an embodiment, the control device 300 may store information of the smart plugs respectively connected to the home appliances instead of the information of the home appliances in the storage unit 320.

The control device 300 may transmit the information generated in the operation S1410 to the terminal 400 connected to the control device 300 (S1420).

The terminal 400 may display the received information through the display unit to provide the information to the user. The user may determine whether or not to use each home appliance for each time on the basis of the displayed information.

The operations S1400 to S1420 will be described in more detail with reference to FIGS. 11 and 12.

FIG. 11 is a table showing predicted results of the time-based power generation amount when the control device predicts the time-based power generation amount of the PV module according to an embodiment.

FIG. 11 shows the sixth table, TABLE 6 including the prediction information on the time-based power generation amount of the PV module 111. The control device 300 may generate the prediction information on the basis of the power generation performance of the PV module 111, the weather forecast, the past generation amount information, and/or the sunlight irradiation angle as described above.

According to an embodiment of FIG. 11, the predicted power generation amount from 8:00 hours to 9:00 hours is about 1 kWh, and the predicted power generation amount from 9:00 hours to 11:00 hours is about 2 kWh. The predicted power generation amount from 11:00 hours to 15:00 hours is about 2.5 kWh, the predicted power generation amount from 15:00 hours to 17:00 hours is about 1.5 kWh, and the predicted power generation amount from 17:00 hours to 19:00 hours is about 0.5 kWh. In general, a power generation amount from 11:00 hours to 15:00 hours with a high sunlight irradiation angle may be higher than other time zones, but this may vary depending on weather forecasts and the like.

According to an embodiment, the control device 300 may store the generated prediction information. Also, the control device 300 may transmit the generated prediction information to the terminal 400 to provide the prediction information to the user.

FIG. 12 is a table showing information on a usable time of each of the home appliances, which is generated by the control device on the basis of the predicted results of the time-based power generation amount of FIG. 11.

In FIG. 12, it is assumed that the home appliances are a washing machine and an air conditioner for convenience of explanation. However, according to the embodiment, the types and the number of home appliances may vary.

Referring to FIGS. 11 and 12, the control device 300 may generate information on a usable time of each of the home appliances on the basis of the generated prediction information. The usable time of each of the home appliances may represent a time zone in which the home appliances may be used only by the power generated by the PV module 111.

Hereinafter, the usable time of each of the home appliances will be described with reference to the sixth table, TABLE 6 in FIG. 11, and the seventh table, TABLE 7 in FIG. 12. In this disclosure, although it is assumed that the power consumption of the washing machine is about 700 kWh per hour, and the power consumption of the air conditioner is about 2 kWh per hour, the power consumption of the washing machine and the air conditioner may vary according to the embodiment.

Since the predicted power generation amount from 8:00 hours to 9:00 hours is about 1 kWh per hour, the control device 300 may determine that the washing machine may be used in the corresponding time zone, and the use of the air conditioner is impossible.

On the other hand, since the predicted power generation amount from 9:00 hours to 11:00 hours is about 2 kWh per hour, and the predicted power generation amount from 11:00 hours to 15:00 hours is about 2.5 kWh per hour, the control device 300 may determine that the washing machine may be used in the corresponding time zone, and the air conditioner may also be used. However, the information on the usable time of each of the home appliances shown in the seventh table, TABLE 7 in FIG. 12, represents whether or not the washing machine and the air conditioner are usable, but does not include information whether the washing machine and the air condition are usable at the same time.

Since the predicted power generation amount from 15:00 hours to 17:00 hours is about 1.5 kWh per hour, the control device 300 may determine that the washing machine may be used in the corresponding time zone, and the use of the air conditioner is impossible. Finally, since the predicted power generation amount from 17:00 hours to 19:00 hours is about 0.5 kWh per hour, the control device 300 may determine that the use of the washing machine and the air conditioner in the corresponding time zone may be impossible.

The control device 300 may generate the information on the usable time of each of the home appliances on the basis of the determination result of the availability of the home appliances for each time. Also, the control device 300 may store the generated information in the storage unit 320 or transmit the generated information to the terminal 400. The terminal 400 may display the received information through the display unit to inform the information to the user. The user may determine an optimal usable time zone of the washing machine or the air conditioner on the basis of the information.

FIG. 13 is a flowchart illustrating a method for controlling operations of the home appliances through the control device on the basis of the predicted results of the time-based power generation amount of the PV module according to an embodiment.

Referring to FIG. 13, the control device 300 may predict the time-based power generation information of the PV module 111 (S1700). The operation S1700 is substantially the same as the operation S1400, and thus, its description will be omitted.

The control device 300 may generate an operation schedule of the home appliances on the basis of the predicted power generation amount and the priority order of the home appliances (S1710).

The priority order of the home appliances may be set in various manners. For example, average power consumption information of each of the home appliances may be stored in the storage unit 320 of the control device 300. In this case, the control device 300 may set the priority order of each of the home appliances in descending or ascending order of the power consumption on the basis of the stored average power consumption information of each of the home appliances.

According to an embodiment, the usable time zone information of each of the home appliances may be stored in the storage unit 320. In this case, the control device 300 may set the priority order of the home appliances that are most frequently used for each time zone to a high priority order, and set the priority order of the home appliances having a low frequency of use to a low priority order. That is, the control device 300 may set the priorities of the home appliances differently according to the time zone.

According to another embodiment, the control device 300 may receive information for setting the priority order of the home appliances from the terminal 400 and may set the priority order for each home appliance on the basis of the received information. Particularly, the terminal 400 may receive a priority order reference from the user or directly receive the priority order of each of the home appliances. The terminal 400 may transmit information including the input priority order reference or the priority order of each of the appliances to the control device 300. The control device 300 may set the priority order for each home appliance on the basis of the received information.

Since the above-described priority order setting methods for each appliance are merely examples for convenience of explanation, the control device 300 may set priority orders for each appliance by various methods.

Also, the control device 300 may store the set priority order for each home appliance in the storage unit 320 or transmit the set priority order to the terminal 400. The terminal 400 may display the received priority order through the display unit. According to an embodiment, the terminal 400 may receive a modification request from the user on the basis of the displayed priority order. In this case, the terminal 400 may transmit the modification request to the control device 300, and the control device 300 may modify the priority order in response to the received modification request.

With reference the operation S1710, a specific example of the priority order of each appliance and the operation schedule of home appliances will be described with reference to FIGS. 14 to 15.

FIG. 14 is a view illustrating an example of priority order information set with respect to each of the home appliances.

Although the priority order information for each of the air conditioner, the washing machine, the refrigerator, and the dishwasher is illustrated in FIG. 14, the kinds of home appliances may vary according to the embodiment.

Referring to FIG. 14, the control device 300 may set the priority order with respect to the air conditioner, the washing machine, the refrigerator, and the dishwasher. Although the priority order of the home appliances is illustrated to be set differently according to the time zone in FIG. 14, the priority order of the home appliances according to the embodiment may be set to be constant regardless of the time zone.

The control device 300 may set the priority order for each time zone on the basis of the usable time zone information of the air conditioner, the washing machine, the refrigerator, and the dishwasher. As described above, the usable time zone information may be previously stored in the storage unit 320. The usable time zone information may include information on the frequency of use of each of the home appliances for each time zone for a predetermined period (e.g., ‘3 months’, etc.). Here, the frequency of use may represent the sum of the number of days when the home appliance operates in the corresponding time zone. That is, the frequency of use is the sum of the number of days when the home appliances operating in the corresponding time zone for the predetermined period (3 months) (for example, in the time zone from 8:00 hours to 11:00 hours, ‘90 days’ in case of the refrigerator, ‘30 days’ in the case of the washing machines, and ‘5 days’ in the case of the air conditioners, etc.).

Referring to the eighth table, TABLE 8 in FIG. 14, when the frequency of use is high in the order of the refrigerator, the dishwasher, the washing machine, and the air conditioner in the time zone from 8:00 hours to 11:00 hours, the control device 300 may set the priority order so that the priority of the refrigerator is first, the priority of the dishwasher is second, the priority of the washing machine is third, and the priority order of the air conditioner is fourth.

Referring to the eighth table, TABLE 8 in FIG. 14, according to the above-described priority order, since the frequency of use increase in order of the refrigerator, the air conditioner, the washing machine, and the dishwasher in the time zone from 11:00 hours to 15:00 hours, the control device 300 may set the priority order of the refrigerator first, the priority order of the air conditioner second, the priority order of the washing machine third, and the priority order of the dishwasher fourth. In the time zone from 15:00 hours to 17:00 hours, since the frequency of use increase in order of the refrigerator, the washing machine, the air conditioner, and the dishwasher, the control device 300 may set the priority order of the refrigerator first, the priority order of the washing machine second, the priority order of the air conditioner third, and the priority order of the dishwasher fourth. Finally, in the time zone from 17:00 hours to 19:00 hours, since the frequency of use increase in order of the refrigerator, the dishwasher, the washing machine, and the air conditioner, the control device 300 may set the priority order of the refrigerator first, the priority order of the dishwasher second, the priority order of the washing machine third, and the priority order of the air conditioner fourth.

According to an embodiment, the control device 300 may receive the priority order information for each home appliance from the terminal 400. In this case, the priority order information for each home appliance may be automatically generated by the terminal 400 or manually generated by the user for the terminal 400.

FIG. 15 is a view illustrating an example of an operation schedule of each of the home appliances, which is generated by the control device on the basis of the embodiments of FIGS. 11 and 14, according to an embodiment.

Here, it is assumed that the power consumption of the air conditioner of the home appliances is about 2 kWh per hour, the power consumption of the washing machine is about 700 Wh per hour, the power consumption of the refrigerator is about 150 Wh per hour, and the power consumption of the dishwasher is about 500 Wh per hour.

The control device 300 may generate operation schedules of the home appliances on the basis of the predicted power generation amount of the PV module 111 and the priority order information of each home appliance.

Referring to FIGS. 11, 14, and 15, the estimated power generation amount from 8:00 hours to 9:00 hours is about 1 kWh per hour, and the sum of the power consumption of the refrigerator having the first priority order and the dishwasher having the second priority order is about 650 Wh per hour. Thus, the control device 300 may classify the refrigerator and the dishwasher as operable devices in the time zone from 8:00 hours to 9:00 hours. According to an embodiment, to use all the power generated by the PV module 111, the control device 300 may include the washing machine having the third priority order as the operable device.

The estimated power generation amount from 9:00 hours to 11:00 hours is about 2 kWh per hour, and the sum of the power consumption of the refrigerator, the dishwasher, and the washing machine is about 1.35 kWh per hour. Thus, the control device 300 may classify the refrigerator, the dishwasher, and the washing machine as operable devices in the time zone from 9:00 hours to 11:00 hours. According to an embodiment, to use all the power generated by the PV module 111, the control device 300 may include the air conditioner having the fourth priority order as the operable device.

The estimated power generation amount from 11:00 hours to 15:00 hours is about 2.5 kWh per hour, and the sum of the power consumption of the refrigerator and the air conditioner is about 2.15 kWh per hour. Thus, the control device 300 may classify the refrigerator and the air conditioner as operable devices in the time zone from 11:00 hours to 15:00 hours. According to an embodiment, to use all the power generated by the PV module 111, the control device 300 may include the washing machine having the third priority order as the operable device.

Referring again to FIGS. 11, 14, and 15, the estimated power generation amount from 15:00 hours to 17:00 hours is about 1.5 kWh per hour, and the sum of the power consumption of the refrigerator and the washing machine is about 850 Wh per hour. Thus, the control device 300 may classify the refrigerator and the washing machine as operable devices in the time zone from 15:00 hours to 17:00 hours. Here, when the air conditioner having the third priority order operates, the total power consumption is about 2.85 kWh per hour, which is higher than the predicted power generation amount. However, when the washing machine having the fourth priority order operates, the total power consumption is about 1.35 kWh per hour, which is lower than the predicted power generation amount. Thus, the control device 300 may classify not only the refrigerator and the washing machine but also the dishwasher as the operable devices. According to an embodiment, to use all the power generated by the PV module 111, the control device 300 may also include the air conditioner as the operable device.

Finally, the estimated power generation amount from 17:00 hours to 19:00 hours is about 0.5 kWh per hour, and the power consumption of the refrigerator is about 150 Wh per hour. Thus, the control device 300 may classify only the refrigerator as the operable device in the time zone from 17:00 hours to 19:00 hours. According to an embodiment, to use all the power generated by the PV module 111, the control device 300 may include the dishwasher having the second priority order as the operable device.

As described above, the control device 300 may classify at least a portion of the home appliances for each time zone as the operable device on the basis of the prediction information on the power generation amount of the PV module 111 for each time zone and the priority order information of the home appliances for each time zone. The control device 300 may generate the operation schedule of the home appliances on the basis of the information of the operable devices, which are classified for each time zone. That is, the operation schedule may include information on whether the home appliances are operable for each time zone. Thus, the operation schedule may represent one embodiment of the information on the usable time for each appliance, which is described above with reference to FIG. 10.

Also, the control device 300 may store the generated operation schedule in the storage unit 320 or transmit the generated operation schedule to the terminal 400.

The description will be made again with reference to FIG. 13.

The control device 300 may control an operation of each of the home appliances 151 on the basis of the generated operation schedule (S1720).

Particularly, the control device 300 may control an operation of each of the home appliances 151 on the basis of the generated operation schedule so that the home appliances 151 operate or do not operate. For this, the control device 300 may transmit a control signal for controlling the operation of each of the home appliances 151 to the HEMS gateway 100. The HEMS gateway 100 may transmit a power supply signal or a power cutoff signal to each of the smart plugs 150 respectively connected to the home appliances 151 on the basis of the received control signal.

The smart plugs 150 may supply power to the home appliances 151 connected to the smart plugs 150 in response to the received power supply signal. In this case, since the power is supplied to the home appliances 151, the home appliances 151 may operate. Also, the smart plugs 150 may cut off the power supply to the home appliances 151 in response to the received power cutoff signal. In this case, since the power is not supplied to the home appliances 151, the home appliances 151 may not operate.

According to an embodiment, when the HEMS gateway 100 and the home appliances 151 are directly connected to each other, the HEMS gateway 100 may transmit an operation signal or an operation stop signal to the home appliances 151 on the basis of the control signal received from the control device 300. Each of the home appliances 151 may perform an operation in response to the received operation signal, or may stop the operation in response to the operation stop signal.

The control device 300 may automatically generate the operation schedules of the home appliances on the basis of the predicted power generation amount of the PV module 111 and the priority order information set for each home appliance. The control device 300 may provide an effect of enabling the efficient use of the PV power by controlling the operations of the household appliances on the basis of the generated operation schedules.

Referring to FIG. 13, according to an embodiment, the control device 300 may monitor the power generation amount of the PV module 111 (S1730).

The PV module 111 or the PV inverter 110 may transmit the power generation amount information of the power generated from the PV module 111 to the HEMS gateway 100, and the HEMS gateway 100 may control the received generation amount information to the control device 300. The control device 300 may monitor the power generation amount of the PV module 111 by receiving the power generation amount information from the HEMS gateway 100.

If a difference between the monitored power generation amount and the predicted power generation amount is equal to or greater than a reference value (YES in operation S1740), the control device 300 may change the operation schedule on the basis of the monitored power generation amount (S1750).

Since the power generation amount predicted by the control device 300 is generated based on the weather forecasts and the like, a difference may occur due to factors such as weather changes and cloud effects. Thus, the control device 300 may calculate a difference between the actual power generation amount of the PV module 111 and the predicted power generation amount and may change the operation schedule when the calculated difference is equal to or greater than the reference value.

FIG. 16 is a view illustrating an example of an operation schedule that is changed by the control device when the power generation amount of the PV module and the predicted power generation amount are different from each other.

Referring to FIGS. 11 and 14 to 16, the estimated power generation amount from 17:00 hours to 19:00 hours is about 0.5 kWh per hour, and the control device 300 may generate an operation schedule for classifying the refrigerator as an operable device between 17:00 hours to 19:00 hours on the basis of the predicted power generation amount.

The control device 300 may monitor the power generation amount of the PV module 111 by receiving the power generation amount information through the HEMS gateway 100. Here, it is assumed that the power generation amount information received through the HEMS gateway 100 corresponds to about 0.7 kWh per hour, and a difference between the monitored power generation amount and the predicted power generation amount is equal to or greater than the reference value.

The control device 300 may change the operation schedule when the difference between the monitored power generation amount and the predicted power generation amount is equal to or greater than the reference value. When comparing the ninth table, TABLE 9, of FIG. 15 to the tenth table, TABLE 10, of FIG. 16, it is seen that the devices capable of operating in the time zone from 17:00 hours to 19:00 hours are changed from the refrigerator to the refrigerator and the dishwasher. That is, the control device 300 may change the operation schedule to classify the refrigerator and the dishwasher as the operable devices on the basis of the monitored power generation amount that is about 0.7 kWh per hour. That is, the control device 300 may actively control the operations of the home appliances on the basis of the actual power generation amount. Thus, the power generated by the PV module 111 may be more efficiently used.

FIGS. 17A and 17B are views illustrating examples of the power usage information for each home appliance, which is provided to a terminal by the control device, respectively.

As illustrated in FIGS. 10 to 16, the control device 300 may control the operations of the home appliances on the basis of the predicted power generation amount of the PV module 111 as described above. The control device 300 may acquire the power consumption information of the home appliances on the basis of the controlled result. For example, the HEMS gateway 100 may receive the power consumption information from each of the smart plugs respectively connected to the home appliances and may transmit the received power consumption information of each of the home appliances to the control device 300. The control device 300 may acquire the power consumption information on the basis of the received power usage amount information of each of the home appliances. The acquired power consumption information may be stored in the storage unit 320 or provided to the terminal 400.

Referring to FIGS. 17A and 17B, the terminal 400 may display the power consumption information for each home appliance, which is received from the control device 300, through the display unit. Power consumption information screen 403 and 404 illustrated in FIGS. 17A and 17B is only an example for convenience of description, and the form and configuration of the power consumption information screens 403 and 404 are not limited thereto.

For example, the power consumption information screens 403 and 404 may include a name of each of the home appliances, the total power usage amount information, the power usage amount information supplied from the PV module 111, the power usage amount information supplied from the power system 121, and the generated electric charge information. That is, the control device 300 may generate the total power usage amount information for each of the home appliances, the usage information of the PV power, the power usage amount information supplied from the power system 121, and the generated electric charge information to transmit the generated power consumption information to the terminal 400.

The total power usage information represents the total amount of power used for the corresponding home appliance for a predetermined time. Although the power consumption information screens 403 and 404 are shown as providing the power consumption information for one day in FIGS. 17A and 17B, the period may be freely changed.

According to an embodiment, each of the power consumption information screens 403 and 404 may further include charge information corresponding to the total power usage amount information. In FIG. 17A, it is seen that the power used for one day by the washing machine is about 2.1 kWh, and the electric charge is about $0.54. The corresponding electric charge represents an electric charge when all of about 2.1 kWh is supplied from the power system 121. Similarly, in FIG. 17B, it is seen that the power used for one day by the air conditioner is about 8 kWh, and when all of 8 kWh is supplied from the power system 121, the electric charge is about $2.24.

The power consumption information screens 403 and 404 may include the power usage amount information supplied from the PV module 111 and the usage amount information of the power supplied from the power system 121. Referring again to FIG. 17A, it is seen that about 1.4 kWh of the power used for one day by the washing machine is the power supplied from the PV module 111, and about 0.7 kWh is the power supplied from the power system 121. Referring again to FIG. 17B, it is seen that about 6.4 kWh of the power used for one day by the air conditioner is the power supplied from the PV module 111, and about 1.6 kWh is the power supplied from the power system 121.

The generated electric charge information may correspond to the usage amount of the power supplied from the electric power system 121 among the total power consumption amount of the home appliances. In FIG. 17A, the power supplied from the power system 121 of the washing machine is about 0.7 kWh, and the electric charge for about 0.7 kWh is about $0.18 so that the daily electric charge of the washing machine may be about $0.18. In FIG. 17B, the power supplied from the power system 121 of the air conditioner is about 1.6 kWh, and the electric charge for about 1.6 kWh is about $0.45. Thus, the electric charge for the air conditioner may be about $0.45.

The control device 300 may provide the power consumption information for each appliance to the user so that the user may easily check the power consumption status of the appliances. Also, the control device 300 may more intuitively provide the benefit of using the power generated by the PV module 111 to the user.

Hereinafter, another embodiment associated with the operation of the control device 300 of the HEMS 10 will be described.

FIG. 18 is a flowchart illustrating an operation method of the control device according to an embodiment.

Referring to FIG. 18, the control device 300 may predict the power generation amount of the PV module 111 (S2200).

For example, the control device 300 may predict the power generation amount of the PV module 111 on the basis of the power generation performance of the PV module 111, the weather forecast, the past generation amount information, the sunlight irradiation angle, and the like.

The power generation performance and the past power generation amount information may be previously stored in the storage unit 320. Also, in the case of the information related to the weather forecast or the sunlight irradiation angle, the control device 300 may receive the information from the meteorological service server connected through the network or may acquire related information through the Internet.

The control device 300 may calculate the PV power generation amount to be sold on the basis of the predicted power generation amount and the power consumption amount (S2210).

The power consumption may represent the power consumption amount in the home in which the PV module 111 is installed or the total sum of the power consumption amount of each of the home appliances 151 connected to the HEMS gateway 100. For example, the control device 300 may predict the power consumption amount on the basis of the power usage information for a predetermined period. According to an embodiment, when the user of the terminal 400 inputs the power consumption amount through the terminal 400, data including the inputted power consumption amount may be received from the terminal 400. The information or data with respect to the power consumption amount may be stored in the storage unit 320.

The control device 300 may calculate the power generation amount to be sold to a third person among the power generation amount of the PV module 111 on the basis of the power generation amount and the power consumption amount of the PV module 111 predicted in the operation S2200.

The operations S2200 to S2210 will be described in more detail with reference to FIGS. 19 to 20.

Hereinafter, it is assumed that the control device 300 predicts the time-based power generation amount of the PV module 111 in FIGS. 19 to 24. That is, the control device 300 may predict the time-based power generation amount of the PV module 111. In this case, the power consumption amount may also represent the time-based power consumption amount. However, according to an embodiment, the control device 300 may estimate the daily power generation amount of the PV module 111 by summing up, and the power consumption amount may also represent the total daily consumption amount.

FIG. 19 is a table showing predicted results of the time-based power generation amount when the control device predicts the time-based power generation amount of the PV module according to an embodiment.

FIG. 19 shows the eleventh table, TABLE 11, including the predicted results with respect to the time-based power generation amount of the PV module 111. The control device 300 may generate the predicted results on the basis of the power generation performance of the PV module 111, the weather forecast, the past generation amount information, and/or the sunlight irradiation angle as described above.

According to an embodiment of FIG. 19, the predicted power generation amount from 8:00 hours to 10:00 hours is total 1 kWh, and the predicted power generation amount from 10:00 hours to 12:00 hours is total 3 kWh. The predicted power generation amount from 12:00 hours to 14:00 hours is total 6 kWh, the predicted power generation amount from 14:00 hours to 16:00 hours is total 5 kWh, and the predicted power generation amount from 16:00 hours to 18:00 hours is total 3 kWh. In general, a power generation amount from 12:00 hours to 14:00 hours having a high sunlight irradiation angle may be higher than other time zones, but this may vary depending on weather forecasts and the like.

According to an embodiment, the control device 300 may store the generated power generation prediction result. Also, the control device 300 may transmit the generated power generation prediction result to the terminal 400 to provide the prediction result to the user.

FIG. 20 is a table showing an example of the PV power amount to be sold, which is calculated based on the predicted results of the time-based power generation amount and a time-based power consumption amount of FIG. 19.

Referring to the eleventh table, TABLE 11, of FIG. 19 and the twelfth table, TABLE 12, of FIG. 20, the control device 300 may calculate the PV power generation amount to be sold on the basis of the time-based predicted generation amount of the PV module 111 and the time-based power consumption amount in the home in which the PV module 111 is installed.

The time-based power consumption amount may be predicted by the control device 300 on the basis of the power usage information for a predetermined period as described above in the operation S2210 of FIG. 18 or may be received from the terminal 400.

The control device 300 may calculate the PV power generation amount to be sold on the basis of the difference between the predicted power generation amount and the power consumption amount. Referring to the eleventh table, TABLE 11 in FIG. 19, and the twelfth table, TABLE 12 in FIG. 20, the predicted power generation amount from 8:00 hours to 10:00 hours is total 1 kWh, and the power consumption amount is total 1 kWh. Thus, the control device 300 may not sell the PV power from 8:00 hours to 10:00 hours. On the other hand, the estimated power generation amount from 10:00 hours to 12:00 hours is total 3 kWh, and the power consumption amount is total 1 kWh. Thus, the control device 300 may sell total 2 kWh of the PV power from 10:00 hours to 12:00 hours. That is, since about 2 kWh of the amount of power generated by the PV module 111 from 10:00 hours to 12:00 hours is not consumed in the home, the control device 300 may sell the remaining power that is about 2 kWh.

Referring again to the eleventh table, TABLE 11 in FIG. 19, and the twelfth table, TABLE 12 in FIG. 20, the predicted power generation amount from 12:00 hours to 14:00 hours is total 6 kWh, and the power consumption amount is total 2 kWh. Thus, the control device 300 may sell total 4 kWh of the PV power from 12:00 hours to 14:00 hours. The estimated power generation amount from 14:00 hours to 16:00 hours is total 5 kWh, and the power consumption amount is total 3 kWh. Thus, the control device 300 may sell total 2 kWh of the PV power from 14:00 hours to 16:00 hours. Finally, since the predicted power generation amount from 16:00 hours to 18:00 hours is total 3 kWh, the control device 300 may not sell the PV power from 16:00 hours to 18:00 hours.

That is, the control device 300 may automatically calculate the PV power generation amount to be sold on the basis of the predicted power generation amount of the PV module 111 and the power consumption amount in the home.

The description will be made again with reference to FIG. 18.

The control device 300 may receive power purchase information from the purchasers (S2220). The control device 300 may receive the power purchase information from the control device of each of the purchasers. According to an embodiment, when each of the purchasers registers the power purchase information in a power supply server or the like, the control device 300 may receive the registered power purchase information from the power supply server.

The power purchase information may include an amount of power to be purchased and price information. The power amount and the price may be different according to the power purchase information. According to an embodiment, the power purchase information may further include information on a purchase time zone.

The control device 300 may set the sales price on the basis of the received purchase information (S2230).

Particularly, the control device 300 may select at least one purchaser to sell the PV power on the basis of the amount of power and the price to be purchased included in the received power purchase information of each of the purchasers. The control device 300 may set the sales price for the PV power generation amount to be sold on the basis of the power purchase information of each selected purchaser. The sales price may be set based on the selling unit price and the PV power generation amount to be sold.

The control device 300 may provide the sales power corresponding to the calculated amount on the basis of the set sales price (S2240).

The providing of the sale power corresponding to the calculated amount may represent that the power corresponding to the PV power generation amount is transmitted to the power system 121, and the purchaser supplies the power corresponding to the PV power generation amount to be sold from the power system 121.

The control device 300 may transmit a control signal for providing the amount of PV power to be sold to the purchaser to the HEMS gateway 100. The HEMS gateway 100 may control the PV inverter 110 and the meter 120 to transmit the PV power generation amount to be sold to the power system 121 via the meter 120 in response to the received control signal.

The operations S2230 to S2240 will be described in more detail with reference to FIGS. 21A to 21B.

FIGS. 21A to 21B are views illustrating an example of an operation in which the sale power is supplied from a seller to a purchaser on the basis of the PV power generation amount to be sold, respectively.

Referring to FIGS. 21A to 21B, the control device of the HEMS 10 of a user A may calculate the time-based PV power generation amount to be sold according to an embodiment shown in FIGS. 19 and 20.

The control device 300 may receive power purchase information of each of the purchasers. For example, the control device 300 may receive the power purchase information of a purchaser B and the power purchase information of a purchaser C. Here, it is assumed that the power purchase information of the purchaser B includes information that he intends to purchase power of 2 kWh at the total cost of $0.18 in the time zone from 10:00 hours to 12:00 hours. Also, it is assumed that the power purchase information of the purchaser C includes information that he intends to purchase power of about 4 kWh at the total cost of $0.36 in the time zone from 12:00 hours to 14:00 hours.

The control device 300 may determine that the PV power generation amount of about 2 kWh from 10:00 hours to 12:00 hours is sold to the purchaser B for the total of $0.18 on the basis of the received power purchase information. That is, the control device 300 may set the sales price for the PV power generation amount of about 2 kWh from 10:00 hours to 12:00 hours as $0.18. Also, the control device 300 may determine to sell the PV power generation amount of about 4 kWh from 12:00 hours to 14:00 hours to the purchaser C to the total of $0.36. That is, the control device 300 may set the sales price for the PV power generation amount of about 4 kWh from 12:00 hours to 14:00 hours as $0.36.

In this case, the control device 300 may transmit information or data related to the power transaction to a control device of the purchaser B and a control device of the purchaser C, respectively. According to an embodiment, the control device 300 may transmit information or data related to the power transaction with the purchaser B and the purchaser C to a server of the power facility 500.

Referring to FIG. 21A, in the time zone from 10:00 hours to 12:00 hours, about 1 kWh of about 3 kWh of the amount of power generated from a PV module 111_1 installed in the home of the purchaser A may be supplied to the home appliances 151 provided in the home. The remaining amount of power that corresponds to about 2 kWh may be supplied to the power system 121 through a meter 120_1, so that a power amount corresponding to about 2 kWh may be sold.

The home of the purchaser B may receive the power amount of about 2 kWh corresponding to the power amount sold by the user A through a meter 120_2. The power amount of about 2 kWh may not be purchased from the power facility 500, but correspond to the amount of power purchased from the user A.

Referring to FIG. 21B, in the time zone from 12:00 hours to 14:00 hours, about 2 kWh of about 6 kWh of the amount of power generated from the PV module 111_1 installed in the home of the purchaser A may be supplied to the home appliances 151 provided in the home. The remaining amount of power that corresponds to about 4 kWh may be supplied to the power system 121 through a meter 120_1, so that a power amount corresponding to about 4 kWh may be sold.

The home of the purchaser C may receive the power amount of about 4 kWh corresponding to the power amount sold by the user A through a meter 120_3. The power amount of about 4 kWh may not be purchased from the power facility 500, but correspond to the amount of power purchased from the user A. Also, when the power consumption amount in the home of the purchaser C is about 7 kWh, a power amount of about 3 kWh may be additionally supplied through the meter 120_3. The power amount of about 3 kWh may be purchased from a seller other than the user A or purchased from the power facility 500.

FIG. 22 is a flowchart illustrating an operation of the control device when an actual power generation amount of the PV module is less than the predicted power generation amount according to an embodiment.

Referring to FIG. 22, the control device 300 may receive information on the actual power generation amount of the PV module 111 and compare the actual power generation amount to the predicted power generation amount.

The PV module 111 or the PV inverter 110 may transmit the actual power generation amount information of the PV module 111 to the HEMS gateway 100, and the HEMS gateway 100 may control the received actual generation amount information to the control device 300. The control device 300 may receive the actual power generation amount information from the HEMS gateway 100.

In the compared results, when the actual power generation amount is less than the predicted power generation amount (YES in operation S2600), the control device 300 may acquire information on the remaining amount of the battery 133 or the EV 141 of the ESS 130 of the HEMS 10 (S2610).

If the actual power generation amount is less than the predicted power generation amount, the PV power amount to be sold to the purchaser may not be provided to the purchaser. In this case, the control device 300 may provide an insufficient amount of the power by using the amount of power stored in the battery 133 of the ESS 130 or the battery of the EV 141. For this, the control device 300 may acquire the information on the remaining amount of the battery 133 or the EV 141 of the ESS 130 of the HEMS 10.

The HEMS gateway 100 may receive the information on the remaining amount of the battery 133 from the ESS 130 or the information on the remaining amount of the battery of the EV 141 from the EV 141 or the EV charger 140. The HEMS gateway 100 may transmit the information on the received remaining amount of the battery to the control device 300.

The control device 300 may determine whether the sum of the actual power generation amount and the remaining battery power is equal to or more than the predicted power generation amount on the basis of the information on the received remaining power of the battery.

When the sum of the actual power generation amount and the remaining battery power is equal to or more than the predicted power generation amount (YES in operation S2620), the control device 300 may supply the power of the battery 133 of the ESS 130 or the battery of the EV 141 by power of a shortage as sales power (S2630). The case in which the sum of the actual power generation amount and the remaining battery power is equal to or more than the predicted power generation amount may represent a case in which the amount of power to be sold to the purchaser is provided by using the PV power generation amount and the amount of power stored in the battery. That is, when the actual power generation amount of the PV module 111 is less than the predicted power generation amount, the control device 300 may supplement the deficiency by using the power amount of the battery.

The control device 300 may transmit a control signal to the HEMS gateway 100 to provide the amount of power of the battery as much as the insufficient amount. The HEMS gateway 100 may respond to the received control signal to control the ESS 130 or the EV charger 140 and thereby to discharge a sufficient amount of power from the battery 133 of the ESS 130 or the battery of the EV 141.

On the other hand, when the sum of the actual power generation amount and the remaining battery power is less than the predicted power generation amount (NO in operation S2620), the control device 300 may purchase as much power as the insufficient amount from another person or power facility to provide the purchased power as sales power (S2640).

That is, when a shortage occurs even when the amount of power of the battery is provided as sales power or when the amount of power stored in the battery is zero, the control device 300 may purchase the power of the insufficient amount from another person or power facility to provide the purchased power as sales power.

The operations S2630 to S2640 will be described in more detail with reference to FIGS. 23 and 24.

FIGS. 23 and 24 are views illustrating an operation in which the sold power is supplied to the purchaser according to an embodiment of FIG. 22, respectively. Hereinafter, FIGS. 23 and 24 will be described by applying the examples illustrated in FIGS. 19 to 21B.

Referring to FIG. 23, in the time zone from 12:00 hours to 14:00 hours, the predicted power generation amount of the PV power generation module 111_1 installed in the home of the user A may be about 6 kWh, and the power generation amount to be sold by the purchaser C may be about 4 kWh. However, the actual power generation amount of the PV module 111_1 in the corresponding time zone may be merely about 3 kWh. Since the power consumption amount in the home of the user A is about 2 kWh in the corresponding time zone, only about 1 kWh of about 3 kWh of the power generation amount of the PV module 111_1 may be provided to the purchaser C. Therefore, deficiency of about 3 kWh may occur.

In this case, the control device 300 may acquire information on the amount of power of the battery 133_1 of the ESS 130_1 and confirm the amount of power of the battery 133_1 on the basis of the acquired information. When the sum of the power amount of the battery 133_1 and the actual power generation amount is equal to or larger than the predicted power generation amount, i.e., when the power amount of the battery 133_1 is equal to or more than the insufficient amount, the control device 300 may transmit the amount of power from the battery 133_1 to the purchaser C.

That is, the control device 300 may transmit a control signal to the HEMS gateway 100 for controlling the battery 133_1 to discharge a power amount of about 3 kWh by shortage. The HEMS gateway 100 may control the battery 133_1 to discharge about 3 kWh of the amount of power of the battery 133_1 in response to the received control signal. Thus, a power amount of about 4 kWh, which is the sum of about 1 kWh of the power generation amount of the PV module 111_1 and about 3 kWh of the power amount discharged from the battery 133_1, may be supplied to the power system 121 through the meter 120_1. The home of the purchaser C may receive the power amount that corresponds to about 4 kWh through the meter 120_3. Also, when the power consumption amount in the home of the purchaser C is about 7 kWh, a power amount of about 3 kWh may be additionally supplied through the meter 120_3.

On the other hand, referring to FIG. 24, when the sum of the power amount of the battery 133_1 and the actual power generation amount is less than the predicted power generation amount, i.e., when the power amount of the battery 133_1 is less than the insufficient amount, the control device 300 may purchase a sufficient amount of power from the other person or the power facility 500 to supply the purchased power to the purchaser C.

For example, when the amount of power of the battery 133_1 is 0, deficiency of about 3 kWh may occur. Thus, the control device 300 may purchase the amount of power as much as the deficiency of about 3 kWh from the user B. According to the result of the purchase, a power amount corresponding to about 3 kWh of the power generation amount of the PV module 111_2 installed in the home of the user B may be supplied to the power system 121 through the meter 120_2.

Thus, a power amount of about 4 kWh, which is the sum of about 1 kWh of the power generation amount of the PV module 111_1 of the user A and about 3 kWh of the power generation amount of the PV module 111_2 of the user B, may be supplied to the home of the purchaser C through the meter 120_3.

That is, according to the embodiment of FIGS. 22 to 24, when the actual power generation amount of the PC generation module 111 is less than the predicted power generation amount, the control device 300 may supply the power amount corresponding to the insufficient power using the battery or purchase the power amount from the other person or the power facility 500 to provide the power. Therefore, it is possible to minimize the limitations that may occur when the actual power generation amount is insufficient.

Although not shown, the power facility 500 may apply a penalty to the user A when the control device 300 purchases and supplies the amount of power as much as the insufficient amount from the other person or the power facility 500. For example, the penalty may be to charge an additional fee at the next power trading or to prohibit power trading for a certain period of time, but the type of penalty is not limited thereto.

FIG. 25A is a view illustrating an example of the PV power usage information provided to the terminal by the control device for a user, and FIG. 25B is a view illustrating an example of the power usage information provided to the terminal by the control device for a different user.

FIG. 25A illustrates an example of a screen 405 including the PV power generation usage information of the user A. As illustrated in FIGS. 18 to 24, the control device of the user A may perform an operation of providing at least a portion of the power generation amount of the PV module 111 as sales power to the purchaser. The control device 300 may acquire the usage information of the power generated from the PV module 111. The acquired PV power usage information may be stored in the storage unit 320 or provided to the terminal 400.

Referring to FIG. 25A, the PV power usage information may include information on the amount of PV power generation amount for a predetermined period of time (e.g., ‘1 day’), the amount of PV power consumed by the user in the home, the amount of PV power sold to another person, and information on the benefit of use.

For example, it is assumed that about 10 kWh of about 18 kWh of the power generated during one day of the PV module 111 was directly consumed, and about 8 kWh is sold to another person. In this case, information on the profit of direct consumption of about 10 kWh and information on the profit of selling about 8 kW to others may be provided together. Here, the benefit of direct consumption of about 10 kWh may represent a benefit generated when about 10 kWh is supplied from the PV module 111 instead of about 10 kWh purchased from the power facility.

Thus, the profits from the use of about 18 kWh of PV power may be $1.79 for direct consumption of about 10 kWh and $2.51 for about 8 kWh including $0.72 for selling to other people.

That is, the control device 300 may intuitively confirm the profit by providing the profit to the user according to the amount of power generated from the PV module 111.

FIG. 25B illustrates an example of a screen 406 including the power generation usage information of the purchaser C. The control device 300 of the purchaser C may acquire the power consumption information for a predetermined period (for example, “1 day”) and store the acquired information in the storage unit 320 or provide the information to the terminal 400.

Referring to FIG. 25B, for example, the power consumption information may include information on the total power consumption, the amount of power supplied from the power system 121 or the power facility 500 of the total usage amount, the amount of power supplied from the PV module 111, and the power amount purchased from other person, and the generated electricity charge.

The total power usage amount represents the total amount of power used for the corresponding home for a predetermined time. In FIG. 25B, it is seen that the total power usage amount for one day in the home of the purchaser C is about 20 kWh, and the electric charge is about $3.59. The corresponding electric charge represents an electric charge when all of about 20 kWh is supplied from the power system 121 or the power facility 500.

The total power consumption may include the amount of power supplied from the power system 121 or the power facility 500, the amount of power supplied from the PV module 111, and the amount of power purchased from others. In case of FIG. 25B, it may be seen that the amount of power supplied from the power system 121 or the power facility 500 is about 9 kWh, the amount of power supplied from the PV module 111 is about 5 kWh, and the amount of power purchased from others is about 6 kWh. Thus, it is seen that the generated electric charge is $1.61 for the power amount of about 9 kWh supplied from the power system 121 or the power facility 500, and $0.54 for the power amount of about 6 kWh purchased from the other person. That is, the purchaser C may intuitively confirm that the power amount of about 5,000 kWh supplied from the PV module 111 reduces the electric charge of $0.90, and the power amount of about 6 kWh purchased from the other person reduces the electric charge of $0.54.

The above-described present invention may be implemented as a computer-readable code on a computer-readable medium in which a program is stored. The computer readable recording medium includes all types of recording devices in which data readable by a computer system is stored. Examples of the computer-readable recording medium include hard disk drives (HDD), solid state disks (SSD), silicon disk drives (SDD), read only memories (ROMs), random access memories (RAMs), compact disc read only memories (CD-ROMs), magnetic tapes, floppy discs, and optical data storage devices. Also, the computer may include a control unit of the control device. Thus, the detailed description is intended to be illustrative, but not limiting in all aspects. It is intended that the scope of the present invention should be determined by the rational interpretation of the claims as set forth, and the modifications and variations of the present invention come within the scope of the appended claims and their equivalents.

According to the embodiment, the control device of the home energy management system may predict the power generation amount of the PV module and the power consumption in the home and calculate the PV power amount to be automatically sold on the basis of the predicted power generation amount and power consumption amount. The control device may automatically perform the power transaction on the basis of the calculated power amount to improve the user's convenience.

Also, the controller of the home energy management system may supplement the insufficient power amount from the battery of the energy storage device or other users or the power facility when the actual power generation amount of the solar power generation module is less than the predicted power generation amount. Thus, it is possible to actively solve limitations that occur when the actual power generation amount of the PV module is insufficient.

Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art. 

What is claimed is:
 1. A control device of a home energy management system (HEMS), the control device comprising: a communication module configured to wiredly or wirelessly connect to a HEMS gateway; a storage configured to store power usage information for a predetermined period in a home in which the HEMS gateway is installed; and a controller configured to: predict a power consumption amount on the basis of the power usage information for the predetermined period, predict a power generation amount of a photovoltaic (PV) module connected to the HEMS gateway, calculate a PV power amount to be sold on the basis of the predicted power generation amount and power consumption amount, receive purchase information of purchasers from a control device of each of the purchasers or a power supply server, select at least one purchaser among the purchasers based on an amount of power to be purchased and price information included in the purchase information, set a sales price with respect to the calculated power amount on the basis of the purchase information of the selected at least one purchaser, control the HEMS so that a sale power corresponding to the calculated power amount is provided on the basis of the set sales price, receive information with respect to an actual power generation amount of the PV module from the HEMS gateway, determine that deficiency of the sale power occurs when the actual power generation amount is less than the predicted power generation amount, receive information on a remaining amount of a battery of an electric vehicle from the electric vehicle or an electric vehicle charger connected to the electric vehicle when the electric vehicle is connected to the electric vehicle charger, control the electric vehicle or the electric vehicle charger so that a power amount corresponding to the deficient power is provided from the battery of the electric vehicle when a sum of the actual power generation amount and the remaining amount of the battery is equal to or more than the predicted power generation amount, and when the power amount provided from the battery is less than the deficient power amount, perform purchasing a power amount corresponding to the deficient power amount from another user or a power facility to provide the purchased power as part of the sale power.
 2. The control device according to claim 1, wherein the controller is configured to transmit a control signal for controlling a meter connected to the HEMS gateway to transmit the sale power corresponding to the calculated PV power amount to a power system.
 3. The control device according to claim 1, wherein the power usage information comprises time-based power usage information for predetermined time zones in the predetermined period, and the controller is configured to predict the power consumption amount as a time-based power consumption amount on the basis of the time-based power usage information, to calculate the calculated PV power amount as a PV power amount to be sold for each time zone on the basis of the predicted time-based power generation amount and the predicted time-based power consumption amount for each time zone, and to set a sales price for each time zone on the basis of the purchase information.
 4. The control device according to claim 1, wherein, when the actual power generation amount is less than the predicted power generation amount, the controller is configured to control a battery of an energy storage device in the home so that a power amount corresponding to the deficient power is provided from the battery.
 5. The control device according to claim 1, wherein the controller is configured to transmit PV power usage information acquired based on a sale power provision result to a terminal through the communication module.
 6. The control device according to claim 5, wherein the PV power usage information comprises at least one of PV power amount for a predetermined period, a power amount of the PV power amount consumed in the home of a user, and information with respect to the sale power amount.
 7. A home energy management system (HEMS) gateway comprising: a wireless communication module connected to home appliances; and a storage configured to store power usage information for a predetermined period in a home in which the HEMS gateway is installed; and a controller configured to: predict a power consumption amount on the basis of the power usage information for the predetermined period, predict a power generation amount of a photovoltaic (PV) module connected to the HEMS gateway, calculate a PV power amount to be sold on the basis of the predicted power generation amount and the predicted power consumption amount, receive purchase information of purchasers from a control device of each of the purchasers or a power supply server, select at least one purchaser among the purchasers based on an amount of power to be purchased and price information included in the purchase information, set a sales price with respect to the calculated PV power amount on the basis of the purchase information of the selected at least one purchaser, control the HEMS so that sale power corresponding to the calculated power amount is provided on the basis of the set sales price, receive information with respect to an actual power generation amount of the PV module from the PV module, determine that deficiency of the sale power occurs when the actual power generation amount is less than the predicted power generation amount, receive information on a remaining amount of a battery of an electric vehicle from the electric vehicle or an electric vehicle charger connected to the electric vehicle when the electric vehicle is connected to the electric vehicle charger, control the electric vehicle or the electric vehicle charger so that a power amount corresponding to the deficient power is provided from the battery of the electric vehicle when a sum of the actual power generation amount and the remaining amount of the battery is equal to or more than the predicted power generation amount, and when the power amount provided from the battery is less than the deficient power amount, perform purchasing a power amount corresponding to the deficient power amount from another user or a power facility to provide the purchased power as part of the sale power.
 8. The HEMS gateway according to claim 7, wherein the controller is configured to control a meter connected to the HEMS gateway to transmit the sale power corresponding to the calculated PV power amount to a power system.
 9. The HEMS gateway according to claim 7, wherein the power usage information comprises time-based power usage information for predetermined time zones in the predetermined period, and the controller is configured to predict the power consumption amount as a time-based power consumption amount on the basis of the time-based power usage information, to calculate the calculated PV power amount as a PV power amount to be sold for each time zone on the basis of the predicted time-based power generation amount and the predicted time-based power consumption amount for each time zone, and to set a sales price for each time zone on the basis of the purchase information.
 10. The HEMS gateway according to claim 7, wherein, when the actual power generation amount is less than the predicted power generation amount, the controller is configured to control a battery of the energy storage device in the home so that power amount corresponding to the deficient power is provided from the battery.
 11. The HEMS gateway according to claim 7, wherein the controller is configured to generate PV power usage information on the basis of the sale power provision result, and the PV power usage information comprises at least one of PV power amount for a predetermined period, a power amount of the PV power amount consumed in the home of a user, and information with respect to the sale power amount. 